package com.macaline.concurrent;

import java.util.Random;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {

    public static void main(String[] args) {
        Semaphore semaphore = new Semaphore(3);

        for (int i = 0; i < 6; i++) {
            new Thread(()->{
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName() + "号抢到了车位");
                    TimeUnit.SECONDS.sleep(new Random().nextInt(3));
                    System.out.println(Thread.currentThread().getName() + "-----号离开了车位");

                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    semaphore.release();
                }
            }, i + 1 + "").start();
        }
    }
}
